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Old 3rd November 2011, 03:35 AM   #1
graygem is offline graygem  United States
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Default Op Amp Rail Splitter Question

I have a circuit with 2 TL074 quad op amps. I'm using 1 of the Amps on the first TL074 as a rail splitter for the other 3 on the same TL074. I need a rail splitter for 3 of the amps on the 2nd TL074. My question is, can I use the one rail splitter, of do I need to use 2 separate splitters? The forth amp on the 2nd TL074 is already being used but doesn't need the half voltage. If I can, what is the best values to use for the splitter's resistors and capacitor?

Thanks for any help.
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Old 3rd November 2011, 03:50 AM   #2
jcx is online now jcx  United States
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if you can have just one "gnd" from one rail splitter in the circuit it will reduce some possible error sources

you do have to check the current into the gnd against the op amp output spec
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Old 7th March 2013, 02:15 PM   #3
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You might consider using this virtual ground circuit for the best results:
A Regulated Virtual Ground Circuit
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Old 7th March 2013, 06:06 PM   #4
stinems is offline stinems  United States
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Don't want to hijack but this might be a simpler solution with fewer parts count. What do you guys think of this one?

Craig's Split Supply
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Old 7th March 2013, 08:23 PM   #5
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I have used that sort of approach before, but with an L165 (3a power opamp). It worked, somewhat, but needed a 100ma + constant current load on it to sound any good. See the L165 datasheet here: http://octopart.com/partsearch#searc...estData&q=l165 On page 6 of the datasheet you will find a circuit for "split supply". The Goldpoint Regulated Virtual Ground really sounds best - by far - in my application. A Regulated Virtual Ground Circuit BTW, you could probably use an LD1085V12 (reducing parts count by 5 parts) instead of the LD1085V shown, if +/- 6V is adequate for your application...
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Old 7th March 2013, 09:25 PM   #6
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Of course, using 7812/7912s and the LD1085V, you can achieve +/-12V outputs along with that really excellent performing (best sounding) REGULATED ground.
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Old 7th March 2013, 09:45 PM   #7
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In the interest of reducing parts count by not using an adjustable regulator such as an LD1085V, but instead using a fixed value 12V regulator:
1) If we cannot get the LD1085V12 (12V, 3A) anymore, try the LM338T (12V, 5A) .
2) There may be some other suitable 12V, 1A - 5A fixed value regulators out there. On this I would like to hear from others... If your application is low enough current you can use a L7812CT, an MC7812, or something similar...
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Old 13th March 2013, 06:47 PM   #8
RNMarsh is offline RNMarsh  United States
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See my original article for audio of a split shunt reg supply in TAA #1/1988. " A Push-Pull Shunt Regulator".... this one started it all for audiophiles.

Thx-RNMarsh
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Old 14th March 2013, 10:23 AM   #9
AndrewT is offline AndrewT  Scotland
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RNM,
is there a link to the article or to a schematic?
Can it be posted here?
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Old 15th March 2013, 05:11 AM   #10
RNMarsh is offline RNMarsh  United States
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I have tried several times tonight to post the pages.... only the first page gets thru... something about a security token missing. What the heck does that mean! frustrating.
I'll try again some other time. !

[I reserved the copy rights on my articles]

Last edited by RNMarsh; 15th March 2013 at 05:24 AM.
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